When Paris Hilton and Kim Kardashian reunited in Ibiza, little did they know they would be part of the "#UltimatePhotoBomb," as noted by the hotel heiress.

Many celebs celebrated Givenchy designer Riccardo Tisci's 40th birthday on Aug. 1. However, little details of the bash were reported, so we had to turn to the guests' Instagram pages to fill us in with what went down.

While Kendall Jenner smooching Justin Bieber was one of our favorite photos, we believe Paris Hilton and Kim Kardashian pictured together (after several years) was the best!

Yes, they each shared the same black-and-white photo, but we're talking about the photo (below) of them unknowingly photobombing Kanye West and Zac Efron's picture! And yes, P-Diddy photobombed their picture as well.

Check out 11 other photobombs from stars and you'll realize that this is the ultimate pic we've seen so far!

13 More Star Photobombers This Way...

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Bane Bombin' a Couple's Wedding Photos in 2011

Actor Tom Hardy decided to give these newlyweds something to remember. The hunky star photobombed their wedding photos in character while filming The Dark Knight Rises, the third part of Christopher Nolan's Batman trilogy, in Pittsburgh.

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Kanye West Gets Chummy With Zac Efron While Diddy Gets Giddy in Ibiza in Early August 2014

...not to mention a Kim Kardashian and Paris Hilton sighting in the back!

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Chris Rock Checking Out Rihanna as She Poses at a Unicef Event: February 2008

Let’s face it: Rihanna is stunning — and Chris’ face knows it! It appears the actor got caught up walking behind the beauty and the cameras were there to capture it all go down.

(Side note: We much prefer her hanging around this Chris than that other Chris.)

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Jay Z’s Not Pleased With Robin Thicke — or Anything That’s Going on Around Him: October 2009

Before Hollywood’s big names knew how to properly bomb, pictures like this captured the perfect bombing moment.

Here’s Jay Z hanging out with Robin Thicke a few years ago. He either hates Robin’s new song — or smells something seriously funky coming from that guy behind the crooner.

It’s one of the biggest and most elegant events of the year, but that doesn’t mean Jesse Tyler Ferguson isn’t going to let a once-in-a-lifetime moment get away from him!

While Miranda Kerr and Orlando Bloom — who are now estranged — pose for a gorgeous photo, the Modern Family star decides to ruin it by jumping and waving behind them.

Thanks to JTF, stars slowly but surely started coming around to the idea of the photobomb.

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Jennifer Lawrence Steals the Show From SJP’s Headdress: The 2013 Met Gala

Sarah Jessica Parker was all excited to show off her extravagant accessory — and Jennifer Lawrence was more than happy to pose with it unbeknownst to the Sex and the City alum!

With her arms out wide and her mouth open, J-Law introduces us to the “I don’t care if I’m around tons of A-listers — this is happening and y’all are going to love it” photobomb. (Marion Cotillard and Lena Dunham watch on puzzled, but we bet they ended up loving the moment just as much as we did.)

Which leads us to…

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Jennifer Lawrence Proving She is the Ultimate Photobomber: The 2014 Golden Globes

Our timeline is a little out of order here, but it's the perfect moment to share this gem of J-Law owning Taylor Swift’s interview with Ryan Seacrest.